﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _06LimitedInput
{
    class Program
    {
        static void Main(string[] args)
        {
            top:
            string str = Console.ReadLine();
            if (str.Length > 20)
            {
                Console.WriteLine("Only 20 characters please!");
                goto top;
            }
            Console.WriteLine(LimitedInput(str));
        }
        static string LimitedInput(string str)
        {
            StringBuilder sb = new StringBuilder(20);
            for (int i = 0; i < 20; i++)
            {
                sb.Append('*');
            }
            for (int i = 0; i < str.Length; i++)
            {
                sb[i] = str[i];
            }
            return sb.ToString();
        }
    }
}
